104 AURIS. 



on base, the whorls of spire strongly plicate below the sutures, folds 

 wanting or reduced to ripples on body-whorl, which is faintly keeled 

 at the subperipheral light band. Whorls 5-5 ; suture margined. 



Aperture vertical, white within (or black toward peristome) ; a 

 more or less obvious rounded notch or sinus at junction of colum- 

 ella with basal lip ; outer lip broadly reflexed and recurved, white 

 with a golden brown outer border its inner edge bearing a slight in- 

 ward-projecting rim or flange, which may be either black or white ; 

 outer margin of the basal lip usually produced downward in a lobe. 

 Parietal wall white within, with a wide black outer band, the colum- 

 ella heavy, slightly convex, white (or in specimens with black flange 

 within outer lip, the columella and entire parietal wall are black). 



Alt. 60, diam. 38 mill. 



Alt. 53, diam. 33 mill. 



Environs of Bahia, Brazil (Moricand). 



Helix (Cochlogena) rhodospira var. chrysostoma MORIC., Mem. 

 Soc. Phys. et Hist. Nat. de Geneve, vii, 1836, p. 28.Bulimus 

 swainsoni PFR., Zeitsch. f. Malak., 1845, p. 156; Conchyl. Cab., p. 

 193, pi. 56, f. 9; Monogr. ii, p. 92 ; iii, 371 ; iv, 439 ; vi,77. DESH. 

 Fer., Hist., p. H6, pi. 152, f. 1, 2. B. melanostoma var. REEVE, C. 

 Icon., pi. 33, f. 203a. Bulimus melanostomus var. SOWB., Conch. 

 Illust., f. 88. Bui. melanostomus scalaris DOHRN, Jahrb. d. D. 

 Malak. Gesel. x, pi. 11, f. 4. 



This species has generally been known by the name given by 

 Pfeiffer in 1845, but it was first described by Moricand as a variety 

 of rhodospira (melastoma) in 1836. 



While closely allied to melastoma, it differs from that species in 

 lacking black spots between the folds on the spire, and in the greater 

 prevalence of white in the aperture and on the outer lip. As in all 

 preceding species of this genus, there are two color-varieties. 



Typical chrysostoma Moric., pi. 38, fig. 6, in which the slight rim 

 or flange within the lip, the columella, and the inner part of the 

 parietal wall are white, and there is a more or less distinct basal 

 notch. 



Var. swainsoni Pfr., pi. 38, fig. 7, in'which the entire parietal wall, 

 the columella, and the inner margin of lip are black, and the baso- 

 columellar curve while abrupt, is not excavated into a notch or 

 sinus. 



